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    "# 第三课 级数与微分方程\n",
    "## 无穷级数\n",
    "### 级数求和\n",
    "`Sum[f[n],{n,n0,n1}]`$=\\sum_{n=n_0}^{n_1}f(n)$\n",
    "> 求级数\n",
    "\n",
    "`Sum[f[n,m],{n,n0,n1}]`"
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